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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 169 (1989), S. 137-142 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Flammschutz von Polymeren durch Entstehung von intumeszierender Kohle wird allgemein auf die physikalischen isolierenden Eigenschaften der bei der Verkohlung entstehenden Oberfläche zurückgeführt. Diese Eigenschaften wiederum hängen von der physikalisch-chemischen Struktur der Kohle ab, über die nur wenig bekannt ist. Es wird gezeigt, daß die Elektronenrastermikroskopie und Mikroanalyse durch ein energiedispersives System Aufschluß geben über die Morphologie und Zusammensetzung solcher intumeszierender Systeme. Die erhaltenen Daten tragen zum Verständnis der Schwerentflammbarkeit bei.
    Notes: The protection provided by intumescent chars against the action of the flame is generally attributed to their physical insulating properties. These in turn depend on the physical chemical structure of swollen char, which however has been scarcely studied. It is shown that scanning electron microscopy and microanalysis by energy dispersive system supply detailed information on the morphology and the chemical composition of intumescent systems. The data obtained contribute to the understanding of the fire retardance mechanism.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 1863-1876 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The oxygen index test is a fundamental tool in basic research on polymer combustion and on mechanisms of fire retardance. Although the oxygen index should provide an evaluation of intrinsic flammability of polymeric materials, its response may depend on geometry of the specimen. This is shown by comparing the behavior of polypropylene fire retarded with different additive systems. The implication of such in mechanistic studies is discussed. Furthermore, new measurements are proposed to be carried out with the oxygen index apparatus, which give parameters related to ease of ignition, behavior on forced burning, and thermal insulating characteristics of char developed on burning the material.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 172 (1989), S. 153-163 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Rasterelektronenmikroskopie und Mikroanalyse mit einem energiedispersiven System zeigen, daß die Struktur des Kohleschaumes, der bei der Verbrennung eines mit einem intumeszierenden Additiv ausgerüsteten, mineralgefüllten Polypropylens entsteht, von der Art des anorganischen Füllmaterials abhängt. Dies könnte durch chemische Reaktionen zwischen dem Füllmaterial und sauren Phosphorbestandteilen des flammhemmenden Additivs verusacht werden. Eine Veränderung der Kohlestruktur ist mit einer Abnahme der Wirkung des flammhemmenden Zusatzes verbunden.
    Notes: Scanning electron microscopy and microanalysis by energy dispersive system show that the structure of the foamed char obtained on burning polypropylene fire retarded with an intumescent additive system, can be strongly modified in the presence of typical inorganic fillers. Modifications involving both the physical and chemical characteristics of the char might be related to chemical reactions between fillers and acid phosphorus moieties of the fire retardant. Fillers that modify the structure of the char tend to decrease the efficiency of the fire retardant system.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 17 (1993), S. 125-129 
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The temperature distribution in the condensed and gas phase during combustion of polymer materials in fire tests was measured by means of thermography. It is shown that these data are very useful for mechanistic rationalization of the diagnostically poor, fail-pass rating of most of these tests. Preliminary data were obtained for polymer materials, fire retarded or not, burning in the widely used Glow Wire and UL 94 tests. It is shown that the relative fire hazard and test rating may depend strongly on the combustion parameter on which the rating is based. Furthermore, detailed data on temperature distribution are helpful in eliminating intrinsic ambiguity of the UL 94 classification in the case of fire-retarded materials burning with dripping.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The behaviour of three typical thermoplastic polymers - polypropylene (PP), polyamide 6 (PA-6), ABS and PP mixed with inert talc or fire retardant magnesium hydroxide or melamine - was assessed in the Cone Calorimeter and in traditional widely used tests. It is seen that the evaluation of the relative fire hazard of the materials, based on simple parameters, can be very different depending on the test used, particularly in the presence of additives. From this point of view, the Cone Calorimeter introduces an additional evaluation which might be as arbitrary as that obtained with any other test. For example, melamine, which is currently used as a fire retardant in several polymers, may be considered as a fire-hazardous additive in PP burned in the Cone Calorimeter if only the maximum of rate of heat release is considered. The data discussed here indicate that the use of the Cone Calorimeter for simple evaluation of materials requires further investigation. It is hown that the Cone Calorimeter is a very promising tool for mechanistic studies on combustion and fire retardance, when its potential in terms of quantitative description of the whole combustion is fully used.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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